LTC4232_15 Datasheet, PDF (1/16 Pages) Linear Technology – 5A Integrated Hot Swap Controller

LTC4232
5A Integrated Hot Swap
Controller
FEATURES
nn _{Small Footprint}
nn _{33mΩ MOSFET with RSENSE}
nn _{Wide Operating Voltage Range: 2.9V to 15V}
nn _{Adjustable, 10% Accurate Current Limit}
nn _{Current and Temperature Monitor Outputs}
nn _{Overtemperature Protection}
nn _{Adjustable Current Limit Timer Before Fault}
nn _{Power Good and Fault Outputs}
nn _{Adjustable Inrush Current Control}
nn _{2% Accurate Undervoltage and Overvoltage Protection}
nn _{Pin Compatible with LTC4217 (DFN Package Only)}
nn _{Available in 16-Lead 5mm × 3mm DFN Package}
APPLICATIONS
nn _{RAID Systems}
nn _{Server I/O Cards}
nn _Industrial
DESCRIPTION
The LTC^®4232 is an integrated solution for Hot Swap™
applications that allows a board to be safely inserted and
removed from a live backplane. The part integrates a Hot
Swap controller, power MOSFET and current sense resis-
tor in a single package for small form factor applications.
The LTC4232 provides separate inrush current control
and a 10% accurate 5A current limit with foldback cur-
rent limiting. The current limit threshold can be adjusted
dynamically using an external pin. Additional features
include a current monitor output that amplifies the sense
resistor voltage for ground referenced current sensing
and a MOSFET temperature monitor output. Thermal limit,
overvoltage, undervoltage and power good monitoring
are also provided.
The LTC4232-1 (separate data sheet) allows faster turn-on
than the LTC4232 by providing 16ms debounce delay and
external control of the GATE ramp rate.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. Hot Swap and PowerPath are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
12V, 5A Card Resident Application with Auto-Retry
12V
*
V_DD
OUT
107k
LTC4232DHC
UV
FB
5.23k
10k
FLT
OV
TIMER
INTV_CC
1µF
GND
GATE
PG
I_SET
I_MON
*DIODES INC. SMAJ22A
V_OUT
12V
150k
+
5A
330µF
20k 10k
ADC
20k
4232 TA01a
V_IN
10V/DIV
I_IN
0.1A/DIV
V_OUT
10V/DIV
PG
10V/DIV
Power-Up Waveforms
CONTACT
BOUNCE
25ms/DIV
4232 TA01b
For more information www.linear.com/LTC4232
4232fb
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